Dipper tooth



D. H. MEYER I 1,722,154

DIPPER TOOTH July23, 1929.

Filed Aug. 6, 1928 2 Sheets-Sheet l D. HLMEYER 1,722,154

July 23, 1929.

Filed Aug. 6, 1928 2 Sheets-Sheet Patented July 23, 1929.

UNITED stars DANIEL HENRY MEYER,

or ELKVILLE, ILLINOIS.

DIPPER TOOTH.

Application filed August 6, 1928. Serial No. 297,758.

This invention relates to an improved tooth construction, for steamshovel clippers,

- and it has more particular reference to the species of tooth commonlyknown in the trade as a two-part tooth, that is, one which is composedof relatively stationary teeth or bodies riveted to the dipper front,and

A renewable points carried thereby.

The object of the two part tooth is that the point can be removed and anew one attached, without disturbing the ,base. This being done, thetooth is again as it was when new, for-the point of the t-ooth takesnearly all of the wear when the dipper is digging. I am aware thatnumerous types of two part teeth have been designed from time to time toaccomplish this desirable result and that the parts of the tooth areheld together in much the same way, usually by a bolt or pin passingthrough the point and the base.

Havingin mind the huge steam and elec tric shovels employed at stripmines and quarries, at the present time, and bearing in mind that thepoint is still held to the base by a bolt or pin, much the same as theoriginal two part tooth, after a week or ten days of digging in shale,and rock, we find that where the larger shovels are used, the diggingtooth is no longer a sharp cutting tool, but rather a blunt stump. Inremoving this point, we find the pin or boltwhich holds it to the baseis sheared so that it cannot be driven out. It must then be cut out witha torch before it can be removed. After the point is removed, we findwehave a manganese steel or other high grade steel casting, which is unfitfor further use, although less than five per cent of it has been wornaway. This point is far too large for the blacksmith to sharpen andtreat, and the result is that it is discarded in the scrap pile.

Often the bolt holding the point breaks, or the bolt hole in the pointbreaks allowing the point to become lost. Frequently the point is lostamong the rock, shale and dirt seldom recovered. Having. experiencedthese difficulties, I, have discovered the need for a revised structurewhich is more dependable and capable of fulfilling the requirement of astructure of this class which is subject to such severe treatment. Ihave therefore provided a relatively small appropriately sharpened andshaped point which is a point, ratherthan one quarter of a dipper tooth,one which does not depend upon a bolt or pin to hold it to the base buthas a large shear annulus on each side for this purpose, one which isproperly braced against any stresses or strains that can be applied tothe tooth, a structure which is not too large to be sharpened andtreated by the average blacksmith, but something which it is believed isan advance ment in the art.

In the drawings:

Figure 1 is an elevational view of a shovel dipper, equipped withanimproved two-part tooth constructed in accordance with the presentinvention.

Figure 2 is a top plan view of the tooth.

Figure 3 is a side elevation View thereof.

Figure 4 is a cross sectional view, taken approximately upon the planeof the line H of Figure '10. I

Figure 5 is likewise a cross section taken on the plane of the line 5-5of Figure 10.

Figure 6 is a similar sectional view, taken on the plane of the line 6-6of Figure 9.

Figure 7 is a detail view of the tapered retaining pin. 1 I I Figure 8is a longitudinal section taken approximately on the plane of the line88' of Figure 3.

Figure 9 is a side elevation of the point disconnected from the base orbody.

Figure 10 is a fragmentary side elevation of the especially designedbase.

Figure 11 is a detail view of a coupling plug, constituting an importantfactor of the invention.

Referring now to Figure 1 of the drawings, it will be seen that 12designates gen-, erally an ordinary dipper, such as is em ployed onsteam and electric shovels of the character used at strip mines andquarries. This is provided on its front withva number of two part teeth,each of which is identical in construction. As before intimated, eachtooth comprises a body or base portion 13 which as better shown inFigure 3, is bifurcated, so that the furcations are permitted tostraddle and be riveted or otherwise fastened to the dipper.

In accordance with the invention, the body is constructed as shownbetter in Figure 10, wherein it will be observed that it is providedwith a reduced extension 14, having a further reduced terminal 15. TheeX-' tension 14 is provided in opposite faces with circular pockets 16,and recesses 17 cooperable with bridging keepers 18.

The portions 14,15 and 16 are adapted for reception in the scored outportion of the point 19. The point is of tapered design and .iscomparatively small ,when considered.

i shown in Figure 8. The recessed portion has ing and breaking of the rThe means is duplicated on opposite sides ot its wall formed withopenings 21 adapted to register with the sockets 16 to'accommodate thecoupling plugs 22. Incidentally the plugs are of dish like constructionand each plug is formed with a central stein 22",having a groove 23, toaccommodate the tapered retaining pin 24. Attention is now invited to anexceptionally important ta'ctor in the present invention, namelytl'lOIDEfiDS provided on the point 19 tor-preventing shearention pin24:.

the point as shown in Figure 8. It comprises, in each instance, anannular outstanch ingrim 25 having diametrically opposite openings foraccommodation of the pins, and extending from the openings areprojections 26, constituting guides as well guards.-

WVith this arrangement, it is obvious that the recessed or socketedportion of the part 19 is simply fitted over the extension 14-, on thebody 13, so that it occupies the connected relationship shown in Figure.8. Then the plug 21 drops down through the annular rim or guard 25,into the socket 16, and the plug is turned so that the grooves 23register with the pin receiving opening in the rim. Next the wedge pinsare driven in, and through the grooves 23, thus holding the plug 21 .inplace, and etfecting a sturdy coupling between the point and theextension 14-. Thereafter, the pins are protected by projecting annuli,and

when it becomes necessary to remove the point to be sharpened, it is aneasy matterquite clear after considering the description of theinvention in connection with the drawings. Therefore a more lengthydescription is regarded unnecessary.

I claim:

1. A two part tooth of the class described comprising a body having anextension at one end provided with a socket, a point having a recess forv reception of said socketed extension, one wall of said recess havingan opening in registry with the socket, a plug removably received insaid socket and opening and eiiecting a coupling" between the point andextension, and removable retaining means for the plug mounted on thepoint, said retaining means comprising a pin, said plug having a groovedportion for reception of the pin.

2. A two part tooth ofthe' class described COIHPl'lSll'lg a body havingan extension at one end provided with a socket, a point having a recessfor reception'ot said socketed extension, one wall of said recess havingan opening in registry with the socket, a plug removably received insaid socket and openin and effecting a coupling between the point andextension, and removable retaining means for the plug mounted on thepoint, sair retaining means comprising a pin, said plug having a groovedportion for reception of the pin, together with an annular outstandingrim mounted on said point and surrounding said opening, said rim'havingholes for passage of the retaining pin.

In testimony whereof IJaflixmysignature.

DANIEL HENRY MEYER.

